These latest sanctions add to a further 10 worldwide bans imposed on players from Korea in June last year.

A FIFA spokesman told CNN: "The K-League first issued the sanctions, which were then extended by the KFA in summer of 2011 to have national scope, and then subsequently FIFA extended them to have worldwide effect.

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In-play betting – The Secret Footballer says in the early days of in-play betting players used to make money by manipulating elements of the match such as who would win the first throw in.

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Photos:Match-fixing in football

Lundekvam speaks out – Former Southampton man Claus Lundekvam has insisted that whilst he and the other players knew what they were doing at the time was illegal, it was never considered more than a bit of fun. Players, he claims, would bet on anything from who would get carded to the recipient of the first throw-in. En route to away matches everything was fair game for a flutter, he says, except for the score.

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Photos:Match-fixing in football

Bohinen's concern – Lars Bohinen enjoyed eight successful years in the Premier League, and played alongside Lundekvam at international level for Norway. He explains that whilst he heard talk of spot-fixing, he never fully bought into the idea. It is only now, years after his retirement, that he considers that gambling talk between the players was more than a harmless joke. He also believes that there is far more addiction amongst top-flight players than people see. "You could sense it from the way they gambled", he says.

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Photos:Match-fixing in football

Adams' addiction – For former Arsenal and England captain Tony Adams holds the matter of addiction amongst professioanl footballers much more seriously. After overcoming drug and alcohol problems he fouded the Sporting Chance Clinic, dedicated to help other sportsmen and women do the same. The Professional Footballers' Association and ex-Gunner Paul Merson are also patrons.

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Photos:Footballers speak out on addiction

Photos:Footballers speak out on addiction

Lundekvam speaks out – Former Southampton defender Claus Lundekvam has claimed there was widespread spot-fixing in the English Premier League. Lundekvam told a Norwegian television channel he and fellow players would bet on minor details of games, such as when the first throw-in would be taken.

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Photos:Footballers speak out on addiction

Bohinen's concern – Lars Bohinen enjoyed eight years in the Premier League and played alongside Lundekvam at international level for Norway. He told CNN there is far more addiction among top-flight players than people see. He said: "You could sense it from the way they gambled."

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Photos:Footballers speak out on addiction

Adams' addiction – Former England captain Tony Adams is one footballer who has lived with addiction. After overcoming drug and alcohol problems he founded the Sporting Chance Clinic, dedicated to helping other sportsmen and women do the same. The Professional Footballers' Association and his one-time Arsenal teammate Paul Merson are also patrons.

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Photos:Juventus revived under president Agnelli

Photos:Juventus revived under president Agnelli

Controversial celebrations – Juventus fans hold up three stars to signify the 30 championships won by the club, but two in 2005 and 2006 have been struck off the official records after the "Calciopoli" match-fixing scandal.

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Photos:Juventus revived under president Agnelli

Match-fixing shame – Former Juventus managing director Luciano Moggi gives testimony at a hearing into the match-fixing scandal. He was banned for life while the club lost two Serie A titles and was relegated to Serie B.

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Photos:Juventus revived under president Agnelli

Unbeaten run to Serie A title – Juventus players celebrate their Serie A title success after going through the 2011-12 league season unbeaten to relegate arch-rivals AC Milan to second place.

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Photos:Juventus revived under president Agnelli

Conte restores Juve pride – Juventus coach Antonio Conte, a former fans' favorite as a player, has transformed his side's fortunes since taking charge at the start of the 2011-12 season.

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Photos:Juventus revived under president Agnelli

Del Piero's farewell – Alessandro Del Piero suffered a disappointment in his farewell match for Juventus, losing the Coppa Italia final to Napoli to end a 43-game unbeaten run this season.

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Photos:Juventus revived under president Agnelli

Like father, like son – Andrea Agnelli is the latest member from the famous family which own FIAT and Juventus to take the helm at "The Old Lady." The son of legendary former president Umberto Agnelli, he took charge in May 2010 and has made sweeping changes at the club.

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"FIFA announced 10 sanctions in June 2012 having received the case files from the KFA, and a further 41 Tuesday. There could still be further cases to follow, but we're not in a position at the moment to make any guess on numbers.

"Of the 51 cases, only one was for betting, whereas all the others were either for giving, or accepting bribes to fix matches.

"Of these 51 cases, 15 went to an appeal and an additional three persons (two players and one coach) committed suicide during the course of the investigations.

"Some of the 51 people involved have also been the subject of criminal proceedings in Korea, including jail sentences."

Soccer has been grappling with cases of match-fixing in recent years with Italian prosecutors conducting a wide-ranging investigation into some of Serie A's most high-profile clubs.

Napoli were hit with a two-point penalty that dropped them from third to fifth in Serie A as part of the ongoing probe, though they vehemently denied any wrongdoing.

Their defender Paolo Cannavaro is appealing his six-month ban for failing to report an illegal approach.

Juventus coach Antonio Conte recently returned from a 10-match touchline ban imposed for failing to report match-fixing while coach at Siena.

In 2006, Juve were stripped of two league titles and relegated to the third division of Italian football -- before later being reinstated in the second tier -- for their part in the "Calciopoli" scandal.

Elsewhere, the president of the South African Football Association (SAFA) and four other officials were suspended in December as part of an investigation into match-fixing ahead of the country hosting the FIFA World Cup in 2010.

It is alleged four friendly games were prearranged for the benefit of convicted Singaporean match-fixer Wilson Perumal and his Football 4U organization.

In response to this threat on soccer's integrity FIFPro, the worldwide players' union, recently announced a project to tackle fixing that will include an education program and an online tool for their members to report illegal approaches.

FIFPro have European Union funding behind their 'Don't Fix It' scheme and will be working closely with Birkbeck University and European soccer's governing body UEFA.

The 21 Korean players who handed themselves in voluntarily will also be required to put themselves forward for community service if they decide they want to return to the game.

A statement on FIFA's website explained: "These services include the provision of coaching classes for local football clubs for youth and adult players; involvement in and support of football for those with disabilities; and the support of ongoing and future domestic anti-match-fixing activities.

"Players who are subject to voluntary probation may produce monthly reports on their respective community service activities, accompanied by documentary evidence of their activity (written, photographic or video).

"The reinstatement of the respective player in football after the probation period will only be decided by the Korea Football Association (KFA)."